Enum Predicate 

pub enum Predicate {
    Function(PredicateFunction),
    Clauses(Box<[Clause]>),
}

A predicate is either a set of compiled clauses or a built-in function.

Variants

Function(PredicateFunction)

A native Rust predicate function.

Clauses(Box<[Clause]>)

One or more compiled Prolog clauses.

Trait Implementations

impl Clone for Predicate

fn clone(&self) -> Predicate

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Predicate

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Predicate

fn eq(&self, other: &Predicate) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Predicate

impl StructuralPartialEq for Predicate